By Gwladys Fouche, Nora Buli and Victoria Klesty OSLO (Reuters) -Norway’s labour minister summoned oil and gas industry executives and a striking labour union to a meeting on Tuesday in a sign that the government could intervene to stop the conflict which has cut the country’s petroleum output. Norwegian offshore oil and gas workers went on strike over pay on Tuesday, the first day of planned industrial action that could cut the country’s gas exports by almost 60% and exacerbate supply shortages linked to the Ukraine war. By Saturday, daily gas exports would be cut by 1,117,000 barrels of oil …